Free Seamless Pattern Checker — Test Tile & Spot Seams
Test if your repeat pattern tiles seamlessly. Upload the image, adjust tile size, and spot seams instantly.
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Instantly check whether a pattern tiles seamlessly. Upload your PNG or JPG, view it tiled at any size, drag to inspect, and export a ready-to-use 1000px preview.
Built for speed, made for quality
Instant tile preview
See your pattern repeated across the whole canvas the moment you upload.
Adjustable tile size
Slide to scale the tile between 50–1000px to preview any use case.
Pan the preview
Drag the tiled canvas to shift the repeat and inspect seams anywhere in the pattern.
Grid overlay
Toggle a grid overlay to make seams pop even in subtle patterns.
Multi-pattern support
Upload several patterns and switch between them with arrow keys.
1000px preview export
Download a high-quality tiled preview ready for Etsy listings or portfolio shots.
How it works
- 1
Upload your pattern
Drag and drop a PNG or JPG of the single-tile pattern you want to test.
- 2
Adjust tile size
Slide the tile-size control to match your target use (small repeats vs. large).
- 3
Toggle the grid & inspect
Turn on the grid overlay to clearly see tile edges. Any visible seams need fixing.
- 4
Download a 1200px preview
Export a ready-to-use tiled preview for listings, portfolio, or testing.
Who it's for
Surface pattern designers
Verify every pattern tiles perfectly before shipping to clients or Spoonflower.
Etsy digital-paper sellers
Preview how your pattern looks repeated across wrapping paper, tumblers, or fabric.
POD pattern shops
Confirm print-ready repeats for apparel, home goods, and accessories.
Frequently asked questions
Bulk DPI Converter
Change the DPI metadata of your PNG and JPG images in bulk for print-ready output. 100% browser-based — your files never leave your device.
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ExploreReady to try Seamless Pattern Checker?
Create your free Mockably account and start using Seamless Pattern Checker plus every other tool — no credit card required.